Topic: TinyMCE 3.3.9.1 Released
This release fixes various browser issues but it's focused on IE 9 beta1 since some larger sites are promoting users to install this even though it's a beta and full of bugs. Some bugs are pretty serious like regexps not working correctly, CSS clipping or onload events. We have reported many of these and will continue to test and report others but it's hard to know what Microsoft will fix and what they will break for the next release. IE8 was a struggle to get working last time since from each beta new bugs appeared and some of them where never fixed even if they where reported early.
We also fixed a issue where Opera 10.62 (Presto) would mysteriously delete elements if you did things with the selection to fast. Sounds like some odd performance feature that has produced new bugs.
Older versions of TinyMCE will still work if you put IE 9 beta1 in compatibility mode. So we recommend upgrading to this release if you have issues with IE 9 standards mode.
Spocke - Main developer of TinyMCE